题目内容
______no doubt that 100 years ago animal testing was cruel but today animals in experiments are
very well taken care of.
A.It is B.There is C.This is D.That is
B
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题目内容
______no doubt that 100 years ago animal testing was cruel but today animals in experiments are
very well taken care of.
A.It is B.There is C.This is D.That is
B